Polyembryony, Biology

Assignment Help:

Polyembryony

Presence of more than one embryo in a seed is termed polyembryony. The phenomenon, first discovered in orange seeds by Leeuwenhoek (1719), attracted considerable attention because of its potential for application in and horticulture. Polyembryony is broadly classified into simple and multiple, depending on whether the supernumerary arises in one or more embryo sacs in the ovule. Simple polyembryony may be sexual or asexual. In sexual polyembryony embryos may originate from the fertilized egg and synergids, or by budding or cleavage of the polyembryony cells or suspensor of the zygotic embryo.

Asexual embryos are produced within the embryo sac without fertilization. Embryos may also originate from diploid nucellar or integumentary cells of the ode and grow into the embryo sac. These embryos are termed adventive or sporophytic. Multiple polyembryonies involve production of accessory embryos from two or more embryo sacs in the same ovule. For example, in the sea Island cotton, Gossypium barbadense, fertilization of egg in one embryo sac stimulates the induction of embryo from an unfertilized egg in the adjacent embryo sac within the same ovule. Thus, diploid-haploid twin embryos are produced in the seed.


Related Discussions:- Polyembryony

Tolerance range, what is the tolerance range of man and tillapia

what is the tolerance range of man and tillapia

Explain nutrition assessment, Nutrition Assessment The nutritional care...

Nutrition Assessment The nutritional care process, you would realize, begins with nutritional assessment. Nutrition  assessment  is  the  evaluation  of  an individual's nutrit

Define principle of detection of metanil yellow, Define Principle of Detect...

Define Principle of Detection of Metanil Yellow? Non-permitted colours like lead chromate, metanil yellow, auramine, rhodamine B are used to brighten the foods especially spice

Explain adverse effects of atazanavir, Explain Adverse effects of Atazanavi...

Explain Adverse effects of Atazanavir  Atazanavir causes indirect hyperbilirubinemia. It has had no adverse effects on lipid profiles, but the drug's long-term effects are unkn

Explain alterations occurring in nuts and oilseeds, Alterations occurring i...

Alterations occurring in nuts and oilseeds Some oilseeds have acquired a great significance in the large-scale industrial production of edible oils.  You have already studied t

What is resection and primary end to end anastomosis, What is Resection and...

What is Resection and Primary End to End Anastomosis ? For neonates and infants the best operation is resection of coarctation and primary end-to-end anastomosis. With the baby

Supportive therapy for diabetes patient, Q. Supportive Therapy for diabetes...

Q. Supportive Therapy for diabetes patient? Certain foods, part of food or food components have been found to be beneficial in managing hyperglycemia. Most of these have been i

Explain terbinafine, Explain Terbinafine Terbinafine (Lamisil)  -  Ter...

Explain Terbinafine Terbinafine (Lamisil)  -  Terbinafine is a synthetic allylamine approved by the FDA for treatment of onychomycosis of the toenail or fingernail due to derm

Factors affecting biotic potential - population growth, Factors Affecting B...

Factors Affecting Biotic Potential - Population Growth Biotic potential differs from one species to another e.g., bacterial populations can grow faster than population of oak

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd